More on the Leaning Tower of Pisa. Refer to the previous exercise. (a) In 1918 the lean was 2.9071 meters. (The coded value is 71.) Using the least-squares equation for the years 1975 to 1987, calculate a predicted value for the lean in 1918. (Note that you must use the coded value 18 for year.)

2.9106

Step-by-step explanation:

According to the information of the problem

Year 75   76   77   78    79    80    81      828384858687

Lean 642 644 656  667   673  688 696  698713717725742757

If you use a linear regressor calculator you find that approximately

so you just find  and then the predicted value would be 106mm

therefore the predicted value for the lean in 1918 was 2.9106